Should LEOS Carry Second Gun on Duty?

This is a discussion on Should LEOS Carry Second Gun on Duty? within the Law Enforcement, Military & Homeland Security Discussion forums, part of the Related Topics category; I think so. A lot of depts will not permit it. Saw a story of a LEO who, after a chase with a BG, the ...

Should LEOS Carry Second Gun on Duty?

I think so. A lot of depts will not permit it. Saw a story of a LEO who, after a chase with a BG, the BG got the officer's gun but did not know how to use it and pulled the trigger several times to no avail. LEO still on the ground pulls out his second weapon and shoots BG before he figures out how the service weapon works. Great result. Good thing LEO was allowed to carry a second gun.
Some depts prohibit it, some allow it, some make it mandatory.
What do the LEOS here think, and others?
I know that the reason for being against it sometimes is that it would be a good "throw down" weapon, but that seems secondary to officer safety, to me. But that is just me.

Well, I have heard for sure that a lot of depts are afraid of that and that is why it is prohibited, but I don't know that that is the only reason.
Does anyone know of another reason why depts would prohibit the carrying of a second weapon by police officers?